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<li class="toctree-l1"><a class="reference internal" href="contract-irs.html">Interest Rate Swaps</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Release notes</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#milestone-2">Milestone 2</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#milestone-1">Milestone 1</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#milestone-0">Milestone 0</a></li>
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</ul>
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<li class="toctree-l1"><a class="reference internal" href="visualiser.html">Using the visualiser</a></li>
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<li class="toctree-l1"><a class="reference internal" href="codestyle.html">Code style guide</a></li>
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<div class="section" id="release-notes">
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<h1>Release notes<a class="headerlink" href="#release-notes" title="Permalink to this headline">¶</a></h1>
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<p>Here are brief summaries of what’s changed between each snapshot release.</p>
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<div class="section" id="milestone-2">
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<h2>Milestone 2<a class="headerlink" href="#milestone-2" title="Permalink to this headline">¶</a></h2>
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<ul>
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<li><p class="first">Big improvements to the interest rate swap app:</p>
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<blockquote>
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<div><ul class="simple">
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<li>A new web app demonstrating the IRS contract has been added. This can be used as an example for how to interact with
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the Corda API from the web.</li>
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<li>Simplifications to the way the demo is used from the command line.</li>
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<li><a class="reference internal" href="contract-irs.html"><span class="doc">Detailed documentation on how the contract works and can be used</span></a> has been written.</li>
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<li>Better integration testing of the app.</li>
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</ul>
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</div></blockquote>
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</li>
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<li><p class="first">Smart contracts have been redesigned around reusable components, referred to as “clauses”. The cash, commercial paper
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and obligation contracts now share a common issue clause.</p>
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</li>
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<li><p class="first">New code in the experimental module (note that this module is a place for work-in-progress code which has not yet gone
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through code review and which may, in general, not even function correctly):</p>
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<blockquote>
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<div><ul>
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<li><p class="first">Thanks to the prolific Sofus Mortensen @ Nordea Bank, an experimental generic contract DSL that is based on the famous
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2001 “Composing contracts” paper has been added. We thank Sofus for this great and promising research, which is so
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relevant in the wake of TheDAO hack.</p>
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</li>
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<li><p class="first">The contract code from the recent trade finance demos is now in experimental. This code comes thanks to a
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collaboration of the members; all credit to:</p>
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<blockquote>
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<div><ul class="simple">
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<li>Mustafa Ozturk @ Natixis</li>
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<li>David Nee @ US Bank</li>
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<li>Johannes Albertsen @ Dankse Bank</li>
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<li>Rui Hu @ Nordea</li>
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<li>Daniele Barreca @ Unicredit</li>
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<li>Sukrit Handa @ Scotiabank</li>
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<li>Giuseppe Cardone @ Banco Intesa</li>
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<li>Robert Santiago @ BBVA</li>
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</ul>
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</div></blockquote>
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</li>
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</ul>
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</div></blockquote>
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</li>
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<li><p class="first">The usability of the command line demo programs has been improved.</p>
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</li>
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<li><p class="first">All example code and existing contracts have been ported to use the new Java/Kotlin unit testing domain-specific
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languages (DSLs) which make it easy to construct chains of transactions and verify them together. This cleans up
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and unifies the previous ad-hoc set of similar DSLs. A tutorial on how to use it has been added to the documentation.
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We believe this largely completes our testing story for now around smart contracts. Feedback from bank developers
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during the Trade Finance project has indicated that the next thing to tackle is docs and usability improvements in
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the protocols API.</p>
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</li>
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<li><p class="first">Significant work done towards defining the “CorDapp” concept in code, with dynamic loading of API services and more to
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come.</p>
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</li>
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<li><p class="first">Inter-node communication now uses SSL/TLS and AMQP/1.0, albeit without all nodes self-signing at the moment. A real
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PKI for the p2p network will come later.</p>
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</li>
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<li><p class="first">Logging is now saved to files with log rotation provided by Log4J.</p>
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</li>
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</ul>
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<p>API changes:</p>
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<ul class="simple">
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<li>Some utility methods and extension functions that are specific to certain contract types have moved packages: just
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delete the import lines that no longer work and let IntelliJ replace them with the correct package paths.</li>
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<li>The <code class="docutils literal"><span class="pre">arg</span></code> method in the test DSL is now called <code class="docutils literal"><span class="pre">command</span></code> to be consistent with the rest of the data model.</li>
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<li>The messaging APIs have changed somewhat to now use a new <code class="docutils literal"><span class="pre">TopicSession</span></code> object. These APIs will continue to change
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in the upcoming releases.</li>
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<li>Clauses now have default values provided for <code class="docutils literal"><span class="pre">ifMatched</span></code>, <code class="docutils literal"><span class="pre">ifNotMatched</span></code> and <code class="docutils literal"><span class="pre">requiredCommands</span></code>.</li>
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</ul>
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<p>New documentation:</p>
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<ul class="simple">
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<li><a class="reference internal" href="contract-catalogue.html"><span class="doc">Contract catalogue</span></a></li>
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<li><a class="reference internal" href="contract-irs.html"><span class="doc">Interest Rate Swaps</span></a></li>
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<li><a class="reference internal" href="tutorial-test-dsl.html"><span class="doc">Writing a contract test</span></a></li>
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</ul>
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</div>
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<div class="section" id="milestone-1">
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<h2>Milestone 1<a class="headerlink" href="#milestone-1" title="Permalink to this headline">¶</a></h2>
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<p>Highlights of this release:</p>
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<ul>
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<li><p class="first">Event scheduling. States in the ledger can now request protocols to be invoked at particular times, for states
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considered relevant by the wallet.</p>
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</li>
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<li><p class="first">Upgrades to the notary/consensus service support:</p>
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<blockquote>
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<div><ul class="simple">
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<li>There is now a way to change the notary controlling a state.</li>
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<li>You can pick between validating and non-validating notaries, these let you select your privacy/robustness tradeoff.</li>
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</ul>
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</div></blockquote>
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</li>
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<li><p class="first">A new obligation contract that supports bilateral and multilateral netting of obligations, default tracking and
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more.</p>
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</li>
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<li><p class="first">Improvements to the financial type system, with core classes and contracts made more generic.</p>
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</li>
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<li><p class="first">Switch to a better digital signature algorithm: ed25519 instead of the previous JDK default of secp256r1.</p>
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</li>
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<li><p class="first">A new integration test suite.</p>
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</li>
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<li><p class="first">A new Java unit testing DSL for contracts, similar in spirit to the one already developed for Kotlin users (which
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depended on Kotlin specific features).</p>
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</li>
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<li><p class="first">An experimental module, where developers who want to work with the latest Corda code can check in contracts/cordapp
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code before it’s been fully reviewed. Code in this module has compiler warnings suppressed but we will still make
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sure it compiles across refactorings.</p>
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</li>
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<li><p class="first">Persistence improvements: transaction data is now stored to disk and automatic protocol resume is now implemented.</p>
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</li>
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<li><p class="first">Many smaller bug fixes, cleanups and improvements.</p>
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</li>
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</ul>
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<p>We have new documentation on:</p>
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<ul class="simple">
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<li><a class="reference internal" href="event-scheduling.html"><span class="doc">Event scheduling</span></a></li>
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<li><a class="reference internal" href="transaction-data-types.html"><span class="doc">Data types</span></a></li>
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<li><a class="reference internal" href="consensus.html"><span class="doc">Consensus model</span></a></li>
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</ul>
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<p>Summary of API changes (not exhaustive):</p>
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<ul>
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<li><p class="first">Notary/consensus service:</p>
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<blockquote>
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<div><ul class="simple">
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<li><code class="docutils literal"><span class="pre">NotaryService</span></code> is now extensible.</li>
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<li>Every <code class="docutils literal"><span class="pre">ContractState</span></code> now has to specify a <em>participants</em> field, which is a list of parties that are able to
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consume this state in a valid transaction. This is used for e.g. making sure all relevant parties obtain the updated
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state when changing a notary.</li>
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<li>Introduced <code class="docutils literal"><span class="pre">TransactionState</span></code>, which wraps <code class="docutils literal"><span class="pre">ContractState</span></code>, and is used when defining a transaction output.
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The notary field is moved from <code class="docutils literal"><span class="pre">ContractState</span></code> into <code class="docutils literal"><span class="pre">TransactionState</span></code>.</li>
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<li>Every transaction now has a <em>type</em> field, which specifies custom build & validation rules for that transaction type.
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Currently two types are supported: General (runs the default build and validation logic) and NotaryChange (
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contract code is not run during validation, checks that the notary field is the only difference between the
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inputs and outputs).
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<code class="docutils literal"><span class="pre">TransactionBuilder()</span></code> is now abstract, you should use <code class="docutils literal"><span class="pre">TransactionType.General.Builder()</span></code> for building transactions.</li>
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</ul>
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</div></blockquote>
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</li>
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<li><p class="first">The cash contract has moved from <code class="docutils literal"><span class="pre">com.r3corda.contracts</span></code> to <code class="docutils literal"><span class="pre">com.r3corda.contracts.cash</span></code></p>
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</li>
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<li><p class="first"><code class="docutils literal"><span class="pre">Amount</span></code> class is now generic, to support non-currency types such as physical assets. Where you previously had just
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<code class="docutils literal"><span class="pre">Amount</span></code>, you should now use <code class="docutils literal"><span class="pre">Amount<Currency></span></code>.</p>
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</li>
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<li><p class="first">Refactored the Cash contract to have a new FungibleAsset superclass, to model all countable assets that can be merged
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and split (currency, barrels of oil, etc.)</p>
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</li>
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<li><p class="first">Messaging:</p>
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<blockquote>
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<div><ul class="simple">
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<li><code class="docutils literal"><span class="pre">addMessageHandler</span></code> now has a different signature as part of error handling changes.</li>
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<li>If you want to return nothing to a protocol, use <code class="docutils literal"><span class="pre">Ack</span></code> instead of <code class="docutils literal"><span class="pre">Unit</span></code> from now on.</li>
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</ul>
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</div></blockquote>
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</li>
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<li><p class="first">In the IRS contract, dateOffset is now an integer instead of an enum.</p>
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</li>
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<li><p class="first">In contracts, you now use <code class="docutils literal"><span class="pre">tx.getInputs</span></code> and <code class="docutils literal"><span class="pre">tx.getOutputs</span></code> instead of <code class="docutils literal"><span class="pre">getInStates</span></code> and <code class="docutils literal"><span class="pre">getOutStates</span></code>. This is
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just a renaming.</p>
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</li>
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<li><p class="first">A new <code class="docutils literal"><span class="pre">NonEmptySet</span></code> type has been added for cases where you wish to express that you have a collection of unique
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objects which cannot be empty.</p>
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</li>
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<li><p class="first">Please use the global <code class="docutils literal"><span class="pre">newSecureRandom()</span></code> function rather than instantiating your own SecureRandom’s from now on, as
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the custom function forces the use of non-blocking random drivers on Linux.</p>
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</li>
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</ul>
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</div>
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<div class="section" id="milestone-0">
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<h2>Milestone 0<a class="headerlink" href="#milestone-0" title="Permalink to this headline">¶</a></h2>
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<p>This is the first release, which includes:</p>
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<ul class="simple">
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<li>Some initial smart contracts: cash, commercial paper, interest rate swaps</li>
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<li>An interest rate oracle</li>
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<li>The first version of the protocol/orchestration framework</li>
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<li>Some initial support for pluggable consensus mechanisms</li>
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<li>Tutorials and documentation explaining how it works</li>
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<li>Much more ...</li>
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</ul>
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